SPRZ450B February 2018 – September 2024 DRA74P , DRA75P , DRA76P , DRA77P
MDR1 Access Can Freeze UART Module
Medium
Because of a glitchy structure inside the UART module, accessing the MDR1 register may create a dummy underrun condition and freeze the UART in IrDa transmission. In UART mode, this may corrupt the transferred data(received or transmitted).
To ensure this problem does not occur, the following software initialization sequence must be used each time MDR1 must be changed:
SR 1.0
AM574x: 1.0
DRA75xP, DRA74xP, DRA77xP, DRA76xP: 1.0
TDA2Px: 1.0
AM576x: 1.0